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Melting and Boiling point

The noble gas...

Question

The noble gas which is not found in atmosphere:

A

N e

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B

A r

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C

R n

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D

K r

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Solution

The correct option is C $R n$
Radon is a radioactive element and is not found in the atmosphere. It is found in rocks containing uranium ores and is produced by the radioactive decay of radium.

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Similar questions

Q. Which one of the following noble gas is not found in the atmosphere ?

Q. Read below given tabular form and answer the questions.

Element	Electronic configuration	Element	Electronic configuration
He	$1 s^{2}$	Kr	$4 s^{2} 4 p^{6}$
Ne	$2 s^{2} 2 p^{6}$	Xe	$5 s^{2} 5 p^{6}$
Ar	$3 s^{2} 3 p^{6}$	Rn	$6 s^{2} 6 p^{6}$

Write the names of 'noble gas' elements.

Q. The noble gas having only two electrons in its valence shell is:
(a) Ar
(b) Ne
(c) He
(d) Kr

Q. Which noble gas is most abundant in the atmospheric dry air?

Q. Which one of the following noble gases is not formed in atmosphere?

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